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Analysis
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max time kernel
147s -
max time network
152s -
platform
windows10-2004_x64 -
resource
win10v2004-20240412-en -
resource tags
arch:x64arch:x86image:win10v2004-20240412-enlocale:en-usos:windows10-2004-x64system -
submitted
25/04/2024, 04:20
Static task
static1
Behavioral task
behavioral1
Sample
2024-04-25_86a2089f6fe1947051453c55fdc3e99c_bkransomware.exe
Resource
win7-20240221-en
Behavioral task
behavioral2
Sample
2024-04-25_86a2089f6fe1947051453c55fdc3e99c_bkransomware.exe
Resource
win10v2004-20240412-en
General
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Target
2024-04-25_86a2089f6fe1947051453c55fdc3e99c_bkransomware.exe
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Size
71KB
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MD5
86a2089f6fe1947051453c55fdc3e99c
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SHA1
129ffd88c09da22faf46e572936e402f9c7ee22c
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SHA256
fcdee2cf79eaf19e606c077ea5f5b3244976f8d595a5650da18448fa05a78e02
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SHA512
9fefdea9157186d25315ea0a2f22c7ef691bddf3a04b6e71102c07175e82f4d0436c848e98d03eb77002a2c72d1a026306fbb62aaa80db60a23b3820f1b4a0cb
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SSDEEP
1536:Fc897UsWjcd9w+AyabjDbxE+MwmvlDuazTp:ZhpAyazIlyazTp
Malware Config
Signatures
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Executes dropped EXE 1 IoCs
pid Process 4500 CTS.exe -
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
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Adds Run key to start application 2 TTPs 2 IoCs
description ioc Process Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\CTS = "C:\\Windows\\CTS.exe" 2024-04-25_86a2089f6fe1947051453c55fdc3e99c_bkransomware.exe Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\CTS = "C:\\Windows\\CTS.exe" CTS.exe -
Drops file in Windows directory 2 IoCs
description ioc Process File created C:\Windows\CTS.exe 2024-04-25_86a2089f6fe1947051453c55fdc3e99c_bkransomware.exe File created C:\Windows\CTS.exe CTS.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
description pid Process Token: SeDebugPrivilege 4460 2024-04-25_86a2089f6fe1947051453c55fdc3e99c_bkransomware.exe Token: SeDebugPrivilege 4500 CTS.exe -
Suspicious use of WriteProcessMemory 3 IoCs
description pid Process procid_target PID 4460 wrote to memory of 4500 4460 2024-04-25_86a2089f6fe1947051453c55fdc3e99c_bkransomware.exe 89 PID 4460 wrote to memory of 4500 4460 2024-04-25_86a2089f6fe1947051453c55fdc3e99c_bkransomware.exe 89 PID 4460 wrote to memory of 4500 4460 2024-04-25_86a2089f6fe1947051453c55fdc3e99c_bkransomware.exe 89
Processes
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C:\Users\Admin\AppData\Local\Temp\2024-04-25_86a2089f6fe1947051453c55fdc3e99c_bkransomware.exe"C:\Users\Admin\AppData\Local\Temp\2024-04-25_86a2089f6fe1947051453c55fdc3e99c_bkransomware.exe"1⤵
- Adds Run key to start application
- Drops file in Windows directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4460 -
C:\Windows\CTS.exe"C:\Windows\CTS.exe"2⤵
- Executes dropped EXE
- Adds Run key to start application
- Drops file in Windows directory
- Suspicious use of AdjustPrivilegeToken
PID:4500
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Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
395KB
MD5fd7bcd736c2e766427c241f571afa8c7
SHA1ab00e8cabd340812f2620f3048a57f75f4363684
SHA25629e68beddf6d79081ea76b1c0a4086efa52859ca6ed7a32352b360d8c7fee3ef
SHA512e6742fb08c157756e78d57a34fafc54a1c61011f8facc0686f880ce820c0e0e7d01afab502e7d52006feea8ff65a610809eaf91bb71ac17587d8785e14ea55c4
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Filesize
71KB
MD528e5e47ecaee8463aa317a9c72ed01e3
SHA1e952707ad6a24b014bd0249c341144b33df095de
SHA256fd3ce1793f316cfe3412488891923e827fc557e4b583c796f575b8f9ab383b70
SHA5123c6db1991266963baccce9f891416ff0ac8c21353678950ff5ceb0961ce22242f4645b8576b6ad7bfa9d8a212b9248c6913314633a6fe59271b7b8f0473ee6b8
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Filesize
71KB
MD566df4ffab62e674af2e75b163563fc0b
SHA1dec8a197312e41eeb3cfef01cb2a443f0205cd6e
SHA256075a6eecd8da1795532318f9cf880efe42461f9464d63f74deb271d33110f163
SHA5121588dd78e6e8972013c40cdb6acfb84c8df7b081197233ce621904b645356c805d0424bb93dd46c55834dc47d9ff39ee1323cf8e670841b3fff24ab98ba87f25